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Home › Infiniti › 2003 › I35 › Repair and Diagnosis › External Pages › Different car › Section 237 (Engine Control System) › DTC P1229: Sensor Power Supply › Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
  1. RETIGHTEN GROUND SCREWS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten engine ground screws. See Figure .
    1. : GO TO 2.
  2. CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect electric throttle control actuator harness connector. See Figure .
    2. Turn ignition switch ON.
    3. Check voltage between electric throttle control actuator terminal 1 and ground with CONSULT-II or tester.
    Fig 1: Checking Voltage Between Electric Throttle Control Actuator Terminal 1 And Ground
    G00787198Courtesy of NISSAN MOTOR CO., U.S.A.

    Voltage: Approximately 5V 

    OK or NG 

    1. OK: GO TO  5 .
    2. NG: GO TO 3.
  3. CHECK SENSOR POWER SUPPLY CIRCUITS 

    Check the following.

    • Harness for short to power and short to ground, between the following terminals.

      ECM terminal 111 and electric throttle control actuator terminal 1. Refer to WIRING DIAGRAM  .

      ECM terminal 111 and APP sensor terminal 6. Refer to WIRING DIAGRAM  .

      ECM terminal 111 and MAF sensor terminal 2. Refer to WIRING DIAGRAM  .

      ECM terminal 111 and EVAP control system pressure sensor terminal 1. Refer to WIRING DIAGRAM  .

      ECM terminal 111 and power steering pressure sensor terminal 1. Refer to WIRING DIAGRAM  .

      ECM terminal 111 and refrigerant pressure sensor terminal 1. Refer to WIRING DIAGRAM  .

    • ECM pin terminal

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair short to ground or short to power in harness or connectors.
  4. CHECK COMPONENTS 

    Check the following.

    OK or NG 

    1. OK: GO TO  7 .
    2. NG: Replace malfunctioning component.
  5. CHECK THROTTLE POSITION SENSOR 

    Refer to COMPONENT INSPECTION  .

    OK or NG 

    1. OK: GO TO  7 .
    2. NG: GO TO 6.
  6. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR 
    1. Replace electric throttle control actuator.
    2. Perform THROTTLE VALVE CLOSED POSITION LEARNING  .
    3. Perform IDLE AIR VOLUME LEARNING  .
    1. : INSPECTION END
  7. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. : INSPECTION END
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